Round Kovar Based Alloy Bar 4j29 Expansion Soft
Brand Name:JX
Certification:ISO
Model Number:4j29 Kovar Alloy Round Bar
Minimum Order Quantity:100kgs
Delivery Time:35days
Payment Terms:L/C, T/T
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Kovar Alloy Round Bar 4j29 Expansion Soft Alloy
4J29 Kovar Alloy Round Bar is also known as Kovar alloy. The alloy
has a linear expansion coefficient similar to that of borosilicate
hard glass at 20-450°C, a higher Curie point, and good
low-temperature microstructure stability.
Kovar Alloy Round Bar has a linear expansion coefficient similar to that of borosilicate
hard glass at 20-450°C, a higher Curie point, and good
low-temperature microstructure stability. The oxide film of the
alloy is dense and can be well wetted by glass. It does not
interact with mercury, and is suitable for use in instruments
containing mercury discharge. It is the main sealing structural
material of electric vacuum devices.
Technical standard
YB/T 5231-1993 "Fe-Ni-Co glass sealing alloy 4J29 and 4J44
technical conditions".
Kovar Alloy Round Bar Chemical Composition in % Kovar
Ni 28,5-29,5% | Fe 51,14-54,5% | C 0.03% | Si 0.3% | Mn 0,4 % | S o 0.015% |
P 0.015% | o 17-18% | Ti 0.1% | Al 0.2% | Cu 0.2% | Cr 0,1 % |
Kovar Alloy Round Bar Picture:
Heat treatment system
The performance test samples for the expansion coefficient and low
temperature microstructure stability specified in the standard are
heated to 900ºC±20ºC in a hydrogen atmosphere, kept for 1h, then
heated to 1100ºC±20ºC, and kept for 15min, at a temperature of not
more than 5ºC/min The speed is cooled to below 200 ºC.
Application overview
The alloy is a typical Fe-Ni-Co hard glass sealing alloy commonly
used in the world. It has been used for a long time in the aviation
factory with stable performance. It is mainly used for glass
sealing of electric vacuum components such as launch tubes,
oscillator tubes, ignition tubes, magnetrons, transistors, sealed
plugs, relays, integrated circuit lead wires, chassis, shells,
brackets, etc. In the application, the selected glass should be
matched with the expansion coefficient of the alloy. Strictly test
its low temperature tissue stability according to the use
temperature. Appropriate heat treatment should be carried out
during processing to ensure that the material has good deep drawing
properties. When using forgings, their air tightness should be
strictly checked.
Round Kovar Based Alloy Bar 4j29 Expansion Soft
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